CASIM : A Multi-fluid MHD Cometary Atmosphere Simulator

Details CASIM : A Multi-fluid MHD Cometary Atmosphere Simulator CASIM : A Multi-fluid MHD Cometary Atmosphere Simulator

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31a0975b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P31A-0975

Physics

6007 Atmospheres: Structure And Dynamics, 6025 Interactions With Solar Wind Plasma And Fields, 6050 Plasma And Mhd Instabilities, 2780 Solar Wind Interactions With Unmagnetized Bodies

Scientific paper

We present new results of our Cometary Atmosphere Simulation (CASIM) code that is presently under development to model the interaction of a cometary atmosphere with the solar wind. Several high-resolution 2-D simulations for a Halley-type comet are shown. In the current simulations we investigate more precisely the evolution of the interaction between the cometary atmosphere and the solar wind starting from the early stages of the comet outgassing ( ˜5. a.u.) to the peak of its activity ( ˜1.5 a.u.). Our code is based on the solution of the multi-fluid MHD equations using an efficient adaptively refined cartesian mesh solver that provides a very high resolution over a large space domain (simulation domain ˜ 10^8 km, highest resolution ˜ 25 m). The multi-fluid approach we chose leads to a more accurate representation of the cometary atmosphere since additional details of the interaction between the neutral gas and the plasma, and their resulting structures are revealed. In particular, the multi-fluid representation of the ion population gives an improved view of the coupling between heavy and light ions and the resulting coma boundaries at different spatial scales. This research is sponsored by NASA and the National Academies.

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